how to fix the remote start not working on my Toyota Highlander Fourth Generation (2020-present)

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

565 words

Problem Statement

Learn how to diagnose and fix the remote start issue on your 2020-present Toyota Highlander. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to avoid shorts
•Ensure the vehicle is in park and the engine is off before conducting repairs

Symptoms

•Remote start button does not respond when pressed
•Vehicle does not start or crank when attempting remote start
•Indicator lights or warnings on the dashboard may illuminate
•Engine starts normally using the key or push-button ignition
•Remote key fob may have a weak battery or show signs of damage

Diagnostic Steps

1
Check the battery level of the remote key fob
2
Ensure the vehicle is in a suitable environment for remote starting (e.g., not in gear, doors closed)
3
Scan the vehicle for any diagnostic trouble codes (DTCs) using an OBD-II scanner
4
Inspect the vehicle's remote start system wiring and connections for any visible damage
5
Test the remote start feature with another key fob if available
6
Verify that the remote start functionality is enabled in the vehicle's settings

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Screwdriver set

Parts Required

•CR2032 key fob battery

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Symptoms

•Remote start button does not respond when pressed

•Vehicle does not start or crank when attempting remote start

•Indicator lights or warnings on the dashboard may illuminate

•Engine starts normally using the key or push-button ignition

•Remote key fob may have a weak battery or show signs of damage

Diagnostic Steps

1
Check the battery level of the remote key fob
2
Ensure the vehicle is in a suitable environment for remote starting (e.g., not in gear, doors closed)
3
Scan the vehicle for any diagnostic trouble codes (DTCs) using an OBD-II scanner
4
Inspect the vehicle's remote start system wiring and connections for any visible damage
5
Test the remote start feature with another key fob if available
6
Verify that the remote start functionality is enabled in the vehicle's settings

Solution

1. Preparation

Gather tools: OBD-II scanner, multimeter, screwdriver set, and a new key fob battery if needed.
Ensure the vehicle is parked in a safe area with the engine off.
Disconnect the battery to prevent any electrical shorts during inspection.

2. Check and Replace Key Fob Battery

Open the remote key fob using a small screwdriver.
Remove the old battery and replace it with a new CR2032 battery, ensuring correct polarity.
Reassemble the fob and test the remote start functionality.

3. Inspect and Repair Wiring Connections

Remove any panels necessary to access the remote start module and wiring.
Visually inspect the wiring for frays, broken connections, or corrosion.
Use a multimeter to test for continuity in the wiring from the key fob receiver to the remote start module.
Repair or replace any damaged wires and reconnect any loose connections.

4. Reset the Remote Start System

Reconnect the battery after completing the previous steps.
Turn the ignition to the "ON" position without starting the engine.
Wait for 10 seconds, then turn the ignition off.
This will reset the remote start system. Test the feature again.

5. Reprogram the Remote Start Feature (if necessary)

If the remote start feature is still inoperative, consult the owner’s manual for specific reprogramming instructions.
Follow the steps to reprogram the remote start feature, which may involve pressing certain buttons in a specific sequence.